A Rutgers neuroscientist who examined MRI images of more than 1,000 people with autism now says a constant stream of involuntary "micro-movements" throughout the body are a core symptom of the disorder.

Mark Johnson runs one of the biggest autism studies in Europe. He and his team of 15 scientists have been meticulously tracking the traits of infant siblings of children on the spectrum for four years.

A new method devised by a Drexel University professor to diagnose children on the spectrum for anxiety symptoms -- which tend to be masked by symptoms of autism -- was proven effective in a recent study.

Nutritional supplements like probiotics are said by some to help manage conditions like autism in children. But experts say there is little scientific basis for the claims, and going overboard could be dangerous.